Effect of Composition and Morphology on Sensor Properties of Aerosol Deposited Nanostructured ZnO In2 O3 Films - Download this document for free, or read online. Document in PDF available to download.

The structural characteristics are investigated of nanoheterogeneous films comprising ZnO, In2 O3 and ZnO + In2 O3 composite produced by aerosol spray pyrolysis technique SPT. The process utilizeswater solutions of zinc chloride and indium nitrate precursors. The X-ray diffraction datashow that the SPT process results in polycrystalline films of hexagonal wurtzite type ZnO, and In2 O3 crystals of cubic structure. SPT-synthesized ZnO + In2 O3composites contain mixtures of thesecrystals. The morphology of the synthesized films is studied by scanning electron microscopy aswell as the dependence of morphology on the synthesis conditions, specifically the temperature ofthe aerosol precipitation and the concentration of the precursors in solutions. The characteristicsof nucleation and growth of oxide crystals during the synthesis of ZnO + In2 O3 composite films arealso considered. The film with the composition 25 wt% ZnO + 75 wt% In2 O3 contains a large numberof small crystal aggregates of arbitrary shape with a high density of contacts between the aggregatesand are characterized by a homogeneous structure with high dispersion. Such morphologyhas high specific surface, which favors high sensory response. In addition, in this range ofaggregate composition the relationship between the particles of the catalytically active component-ZnO, cleavage of hydrogen molecule, and In2 O3particles with a high concentration of conductionelectrons is close to optimal for the maximum sensory effect in the detection of hydrogen.

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